My grandbaby is skinny but she eats so much...

do not worry. People who have a lot of mental work, eat more, like students. As you say, she is a growing baby, she needs more. So everything will be fine.

I think she will be fine. Usually teenagers tend to eat alot more because they are growing a lot and especially if they are active they need to keep up their energy.But in your case if you eat like her at 40 you will probably become overwight because its harder for older women to maintain their weight since their matabolism slows down. Then if you aren't exercising on top of that there is no doubt you will gain weight.

My brother does the same and believe me he is the thinnest person at home!! Children tend to overeat at times but then if they are active and do a lot of jumping around it is all fine. But still to keep her healthy and fit give her lots of fruits and salads to eat. I know how children hate to have that nutritious food but just try to make sure that she supplements her diet with all the necessary nutrition too.

I think as long as your grandbaby is active playing and jumping around, it won't make her overweight. Kids loves to eat a lot as long it suits their taste. In fact many kids that i had seen, always eats a lot when they are still at a tender age like 2 - 6 yers of age. After all, kid who likes to eat a lot is much better than kid that don't like to eat. Parents always worry when their kids don't have good appetite.